Compensating device for furnaces.



F. TSGHUDY. GOMPENSATING DEVICE FOR FURNACES. APPLICATION FILED 0OT.14,1910.

994,892, Patented June 13,1911.

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FRED TSCHUDY, OF BIRMINGHAM, ALABAMA.

GOMPENSATING DEVICE FOR FURNACES.

T 0 all whom it may concern:

Be it known that I, FRED Tsor-iunr, a citizen of the United States, andresident of Birmingham, county of Jefferson, and State of Alabama, haveinvented certain new and useful Improvements in Compensating Devices forFurnaces, of which the following is a specification.

My invention relates to coke ovens, open hearth furnaces and reheatingovens, and has particular reference to means for permitting theexpansion of the brick work thereof.

In the construction of coke ovens, open hearth furnaces and otherstructures of this sort, wherein a large quantity of refractory materialis employed in connection with structural iron or steel, it is desirablethat the parts be securely bound together at the time the structure iscompleted. It has been found, however, if the said members are securelyfastened when the structure is completed that when the fires are startedin the furnace and the brick work begins to expand, the stays must beloosened to permit this expansion, otherwise the holding members will bebroken. It has been the custom therefore to secure these parts together,particularly in open hearth furnaces, with long bolts or buck stays andwhen the fires were started and the brick work began to expand, toloosen the nuts on the ends of the bolts to permit such expansion.

This is an undesirable necessity and therefore one of the objects of myinvention is to so mount the cross bolts that the expansion of the brickwork will be taken care of without the necessity for loosening the nutson the ends of the bolts from time to time.

Referring to the drawings; Figure 1 is a side elevation of an openhearth furnace having buck stays provided with my improved means forpermitting expansion of the brick work. Fig. 2 is an enlarged sectionaldetail on the line 22 of Fig. 3, and Fig. 3 is an end view of the partsas they would appear in operation.

Inasmuch as the open hearth furnace shown in the drawings of itselfforms no part of my invention, I will describe the same in a general wayonly.

The furnace to which my invention is applied, as shown by the drawings,is composed of the furnace portion 10, having openings 11, therein andprovided with up- Specification of Letters Patent.

Application filed October 14, 1910.

Patented June 13, 1911.

Serial No. 587,134.

rights 12, on the sides thereof and uprights 13, on the ends thereof. Atthe ends of these upright members, which may be of channel shape or anypreferred form, I prefer to mount a member 1 1, which serves as a seatfor the head of the connecting bolt or buck stay. As will be seen, thesemembers 14, are provided both at the top and bottom of the uprightmembers.

In the construction shown in the drawopening slightly larger at 19, thanthe diameter of the bolt 15, and at 20, considerably larger than at 19.At the point where the opening 20, is contracted to the size of theopening 19, I provide a plurality of radial interstices 21. Within theopening 20, I seat a soft metal bushing or washer 22, and within thissoft metal bushing and seated next to the bolt, I mount a steel bushing'23, which is of approximately the same external diameter as that of theopening 19. The part 18, may be formed of cast iron, if desired, and thepart 22, of lead, lead alloy or any other relatively soft metal. Seatedon the part 22, is an iron washer 24, with which the nut 17, is adaptedto cooperate. As will be seen, if the pull on the nut caused by theexpansion of the brick work in the furnace becomes greater than theresistance of the soft metal bushing 22, the metal in the said bushingwill be caused to flow outwardly through the radial openings 21, thusrelieving the bolts from any extreme strain which would be liable tocause breakage thereof.

It will be understood that although I have shown this means forpermitting expansion in connection with an open hearth furnace, it maybe applied to various other structures with equal results and furtherthat modifications of my invention may suggest themselves to thoseskilled in the art and for that reason I do not wish to limit myself tothe precise construction herein shown.

I claim:

1. A compensating device for furnaces which comprises in combination, abolt, a bearing member of hard metal provided with a recess, a nut forsaid bolt and a washer of relatively soft metal interposed between saidbearing member and said nut and seated within the. recess in saidbearing member, substantially as described.

2. A compensating device for furnaces which comprises in combination, abolt, a bearing member of hard metal provided with a recess, a nut forsaid bolt, a washer of relatively soft metal interposed between saidbearing member and said nut and seated within the recess in said bearingmember, and a washer of hard metal seated between said nut and said softmetal washer, substantially as described.

'3. A compensating device for furnaces which comprises in combination, abolt, a bearing member of hard metal, a nut for said bolt, and a washerof relatively soft metal interposed between said nut and said bearingmember, said bearing member being arranged to permit the flow of thesoft metal in said washer, substantially as described.

4. A compensating device for furnaces which comprises in combination, abolt, a bearing member of hard metal provided with a recess, a nut forsaid bolt and a washer of relatively soft metal interposed between saidbearing member and said nut and seated within the recess in said bearingmember, said bearing member being pro vided with openings whereby thesoft metal of said washer may escape under pressure, substantially asdescribed.

5. A compensating device for furnaces which comprises in combination, abolt, a bearing member of hard metal provided with a recess, a nut forsaid bolt and a washer of relatively soft metal interposed between saidbearing member and said nut and seated within the recess in said bearingmember, said bearing memberbeing provided with radial openings wherebythe soft metal of said washer may escape under pressure, substantiallyas described.

6. A compensating device for furnaces which comprises in combination, abolt, a bearing member of hard metal provided with a recess, a nut forsaid bolt, a washer of relatively soft metal interposed between saidbearing member and said nut and seated within the recess in said bearingmember, and a washer of hard metal seated between said nut and said softmetal washer, said bearing member being provided with radial openings atthe base of said recess, whereby the soft metal of said washer mayescape under pressure, substantially as described.

FRED TSCHUDY.

Witnesses F. PEITER, E. G. BERFORD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, I). G.

